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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ded4da88f2dff6af1a9e6154f30210d3637aa8e264b331fc326dc41905fc5f28' 
  AND token = 'Nz93fLcPmcmbC8xH3Ugq83WdLvV4tWb6ue+WWe2SrbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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