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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '073663f4df483bd1f311607410b4b7b32a63e3938bef268918e71328a8e8df0f' 
  AND token = 'TrCevUt7+xxW937D2Y7xuSVQL0pHQ4toiEXt2EpYyEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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