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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd479663ca65eb7b2170f868ed89c7d067397a8610fc323c7c7f4ddb322e7d4e6' 
  AND token = 'L9Z/lUeUL6JY0c+LFwTTfxefTkVgAVU021P3cAPjxc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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