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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0176af1b8b24d6e3f3e647db48af8ed67ec72f324d86199374a4f87a1d94268b' 
  AND token = '8/e6ZhchDChyAqGeK1osbVQHjndr/AFGptrAL17qM0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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