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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd392ddb848d0256d832cbb96263a83e3980c94f8b728ea5e66491e38ffd33c' 
  AND token = 'jOtoRug142q8M4aE52RN7OXCZxg3puB3BBlYXYZFBvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}