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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0e242e4c9e65664d76d5ff13b32c23b67f691e358a6f657b535460f57aeb95' 
  AND token = '69BStJAf9CeiCzuwoOSZgYmMrc1CO75ZWn7+ra2LTGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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