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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f061c44d539dd7dc67634fe642d00e0efd35c9f8f9be4ebb9f45ae5044d3707f' 
  AND token = 'EvxZR6sYn+k9m0svCpW5ttSsaw8NBz359Jfl6vmDMdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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