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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52bbb2b838bd27241ab8faca9508ff7810df03980787fd96f93ab9ea39802fb' 
  AND token = '9zjb5sk2qRbycSxMJxB91molnw+n7T2hQwurFk/nTKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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