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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc1aa6a7e73a728f52182396cf497d497eb3f13f182fa7ec937072f1073f016' 
  AND token = 'UldHjIJcw28w2/qcsROQq1mOU6mxGijZ3fd8QzNmfSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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