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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9acb7b5573f5acc0184171075ed9427956a8ee69cb0b13b1fd63fa77fa49574f' 
  AND token = 'FDdC002jz8GxjlVUC2cRjv+AXvLXDZS70pSUKrNJ4Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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