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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd88ae6219e96fc17a168dce9faa00a4efb9a19143398341e6b97cc30e14cbe1' 
  AND token = 'CWN2tOC54Hx3ULUq3+dpJ6H8A7D1nadLQnhXtzElMGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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