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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4067c009d52c04a56c83f2834a3ab2100f38fb634eafad57236f752031dd23b' 
  AND token = '6nwQ3ZSKtGuT4CkT+yPKViJiYYekIO0+6874CoWm54I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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