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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e4f0cdb66e0f940bfcff916fe95c16b69f417c9bbf0ad7f152be3e4d5203c84' 
  AND token = '9opIaElOb9DzgFzdlPspo2ZwPWKAENM1u7m8SOnELFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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