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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a580e58618ed57bb0f35fc1dd228a0e2e36f904d858415ad3e68ab8e01fa924d' 
  AND token = 'iNy3lv3raMlxDjlu1jEHedUEBLrPZAzxXPg5Z4zkrz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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