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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3719fdd3083f52faa57b838dfe526616ff5953e2e5bb3187f60c719c295a1795' 
  AND token = 'oTMysqf5YnSyQqztDU//ECldbLVxF5dkFaS0kx72QKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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