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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cae844017898bd563546254d497ed305f76a8e2634eb76f8ef0c2931083e5ba' 
  AND token = 'VSQR5Zzze+dZhO9iyD4IECSbeNGwKAewQ0RkbMVE4m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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