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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a042033a3e0a4434648fd952a180162c6798b4136ef0423d3aa81cb736e708' 
  AND token = 'mru0NTMoFJOYnYby3LVDDZ6WqXMBYOuTrNKp3KFWnQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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