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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f17ad80f2d0272508a86ae92953e3f1dcf200a9aa21bc9fb16dd3afc61ac05bd' 
  AND token = 'i4+7AISYAc0sIAyANWMh5KuoYW5jq5+1zmZUg6Ul87k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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