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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acd0dfa8419ae03158d8b50a43d72ff0e4777b9e4d6ef5272891b9b3956db2c1' 
  AND token = 'b0QfV7Z3qdrydlsnVh6fw8AFc2WidC1cTCvQmAlrEpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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