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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ae129f26f4b173cfaf0c8da33a2622c78a2cd56aad43f4aaefc2e8fb5bc800' 
  AND token = '1k6ZYbTYeNhUcQSxd6szDF8h6dmKi1oINJt31nghBq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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