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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66aeaa8cd4e7d422afd378880e222d0fdb6ada5f930d88218d1dee8aaf026cc6' 
  AND token = '39v0sX91qaaosw7YFuODaI4/NIFOF4p4HbcxFrg5ltk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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