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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd7b1869244f8790bceb8299769189dec95735ba333c910934460baf79bb19a' 
  AND token = 'y2DXziARs5DeKoxCWlz14slWECIDEf8uD4EmB3UZ10g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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