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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00be639d8dff8332cc09e4fb0d0a0c96879200bb66762741e168ab884a583f73' 
  AND token = 'ctAAuL1x7jL7EGP5+RrBHfCNYNOUlzLMHyefw1PoNn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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