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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c770b7badf1bda757c8e7f685512b5256585d2ba15a1447c40c433ff729e09f' 
  AND token = 'pRH5FrJnVxXo45onTCZEIqMhLw3zHaMySQbMJuAOaPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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