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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d0c41bf8ef8d79f5e8c12324229382fb55aa5d201bedf09b0ba7fa84f01ce8' 
  AND token = 'xKVTxq9r2De/Ov7U2er4jJV7oA6PUhEhbWcUSBYXrVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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