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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '171e772751cc169fd88dca51e82c04cd13e6df3f4f8454ba1c6d1218393bed09' 
  AND token = 'Hn+3kF8IRsJaWP9EWK4Ob1jFKVsLXh0OhPoN/F3+wvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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