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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaab41943b400329cdace7dd9374e67cbd2c278b73e094b56314cb6f4f788ece' 
  AND token = 'yCdlOV7ohnazvdfAGQv/ZtXp5HPCceCe8wbEphWiVbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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