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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada6007fac228ef9210a2dfa370beb1b907e41ba0c3267f180717fdf45fd5d98' 
  AND token = 'xbZeG9GD1bNnsQ4aS0MfIsUqIYB88w4dMDs3LxCYL/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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