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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b05eaa0bc1addbfd0d2d54e6119bdeb142bb447bb5e546e2c3f93858d2adaf6' 
  AND token = 'mqQFefpSnPlZ48Ku3E1Xvk+dTEFZs18WzB6e/2FXIxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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