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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dac8521ad0656b44e90dad3481c7ee49e0158e0285455d3bc0a752e0d252d7d' 
  AND token = 'pHLDckak9+jzoeatUiNbddGewpe5Bv9qDlF95Pa1h0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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