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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da19cd1b25974e08d216e5c3511bd6622eefad6c3cc5c6118952c2a35dab6df' 
  AND token = 'zCGwYhmIWQeEcvezPttWXrsbZA9cUneu+n6GrT1u3RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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