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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b982dc1e117d9b3f146cf1ddad3b412ccb442da39f595b27211bdc1190f667' 
  AND token = 'H7+v++0aLTZ5Jf0kIwAQy8oM4eJSIargDZbvoud2fUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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