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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc79dc6e35e2d54590a6775b82f63f838033269efb915ea28b069b8688f3ff54' 
  AND token = '2m2clPuE2/5IeUxb82DvYRcNNzaG8Nj2KyoAfvNT7z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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