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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66f4f567261d813c534eab7f8227d7204c1e68207f61d6cedd4a70760e70b9dc' 
  AND token = 'g8vE/aGqyM/aGweC4Jey6QYo/v0gGneL3D2tKhGHY4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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