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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '345b0595773565375ddd297426648baa4de64bce7954848f72c5d4ef018964bf' 
  AND token = 'XJXp4y7NHb6rl3UZi9YUyaeFwID7wleBzsm7fO6lads=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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