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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4668695033e250de21bbd01d49a0879eecca6efe681e32551dfac7eed6ab71de' 
  AND token = 'FGzoPd3VUc0hmKRgYr2OJ6mnp9NsuqR8kh2V01jcU3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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