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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19325fe8bb65a3a8f5dcbcd2dfa2d637c5ae11e481078bd7a52a16d85c81f1d5' 
  AND token = 'kgrZPstpqS4DqekmPfk4VVKezXXTNb1W7k8LlPaq5GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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