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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40c8bb020f465d34142eb3b5b6a2cc58931b79e75bb2172aad7bcf2aca459e16' 
  AND token = 'J16izG51Uf8e8+xj/gaOd7DhaoaIjDuGfuhvX3zGJdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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