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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '361b0bfc53dbfec074a7872c422be7829a0aec4c629c4e771d6c673f5a0128dc' 
  AND token = '2Cr/bKeVy3AtVED1TcFaeHr6zMpr+XGYn/wQaUxPURA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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