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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7a744de8c45a9659d9dc192567546b373f851199f8c531a8edc06a6000a7d1' 
  AND token = 'EgG6okxdMpbsAs6wNtd1cGhjeSaLV2TgZMFjU3X99VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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