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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '480b2c37404ecd8a8d124857c645ccc29583d3b273e7f50ceedccb6a2558730b' 
  AND token = 'i/kCEWmrG8LvM4gmMP+hxd8mXBlyjP893AiNFsCWfIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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