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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90be9f8e7c4cd87932c37e321db90ebcadb24fd38dbfdca2d809c683268e1bd' 
  AND token = 'pVHee3q1S3OcadjWnW2h8tOcJrYYlKLQMEf13yh9kCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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