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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd873fea6daac23dd755d4935a7bb1bec9795b20cae47850ce67094a3962bc9e0' 
  AND token = 'g4Y/uH9v1oSy4EnPq3jTaixRh2Pa1rb+kPA4HBLyUK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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