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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c632f43c27f4438add2f9958ea5de1c0c4f90e8d6dad97f4aa24871ef90ef30b' 
  AND token = 'PjShD9IRsm85B1R0eP8Nr0AwXK16gt7lC78dGhsJ/0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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