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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa9c03ec912bebd8d8bda84d72eda566d3ee80e0de6bb615b101130723342fc' 
  AND token = '0CkpiibwP1fmOM/UhopN+Yn+mJrV5QISMUZyaBAFffw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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