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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7317e8a7f764f784da5f23ced6a5dda31d5bd11d6ad7a40d549f23e811b83d82' 
  AND token = 'iyXUX8ISxIrNbJX/H0QZ0iwoTqxZUdp+4g2Vc6lDwhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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