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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b968c1f208670c64c62401561e79282113b82e5d0f27ca65b84dcc912465961c' 
  AND token = 'nsApnLYxh+uq8QwokvwV0yMSF8+gAXVbaigD+v2nteE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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