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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b3dcaf63dd17cb9fcf3e5337eb9436997aca5cb65b52fe98dd931bb3606997' 
  AND token = 'xEkFAfsWpn7fM9UUxOdr3Mvqcq/rcyNFEuezIC8s+sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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