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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36242d7930a3d27a479e3684c73412f445ede7bde346fcadc39c786c7419c68e' 
  AND token = '8wivHQauAveJRdRARP6Jgo1DrhMABlM1qedi+h3HmMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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