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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b9ca8cf3f36eab2800a424ca6ac9e460c38825748c34da206bfa9a564f250d9' 
  AND token = 'zNSgLX3qzZZLCIq2Nj6RVu9ryuaPXsF2a1HWRxi/L9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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