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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e13a5f3ba39651dc6f51965da3df6394e8809d5fca86074cf157fbfbab5500b' 
  AND token = 'ihQMxpnA1Aog15184b7Gl9NymlzyTc57r9oLza/DCNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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