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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9f24f40b555ebda43025608851c165b5844383e5adf39d2a3b154cbd728887' 
  AND token = 'yobWB35jdSy6pDnX/fomln7309EtUxU7saSr6VmB0Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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