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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47bbbcdfbd5fd7293b023b1d8a87f15d46f1009c8cc556eaae0004f88b00dba0' 
  AND token = '7b5ehaMcU/e8YTylDYDrPNu9+K3XqLdqbV07UD5sL80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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