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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904fbaa2ff231dc311570c9f54ced9973a958223349d4daaa8e98d90aadf7299' 
  AND token = 'tx7tBRLqDvCDZssrscncQLK32YT2GXGhAvGy1DxlfH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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