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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16fb5e3fe0eed101125b2bbda8b544b199643eb397637534c94dc01411a8550c' 
  AND token = 'Lic6wi4EmmU22wB8nAncDBkAdlOzrRMZwSGMq2SOfCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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