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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0b65cfd19ef20148f65eb9373b95d2fafe72f0912ad1fc7c816f66380e71a3' 
  AND token = '2rDHF5EWOD0y2Kt1N08SirXlpMksuDMEabEh4U6csM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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