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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e19afcdce1fc752f9d615736d99b240674e0cf6951d967f4dfab551ad0a6a9' 
  AND token = 'mIse+S9r5vosfiKGx1d2P9TDok5rfAhnu7CldtCwV/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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