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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b2957cf10a0ed28621e7b87f437b43bc2ede461c2d3010c87ba451de9386b1' 
  AND token = '5j/xvIRAR4ZR/z939s56PX4TDbQ0sSfsSxHO5iVSvgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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