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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f5a082c0f5ac9be4f2b9e87c62beb7b637b9352766a33fe8ce38469a74aa85' 
  AND token = '4CBLAg2o19e5WAzd0m1QNEIiPv7ph9F3jzAIHU9nmj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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