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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a37ae75b9e5982a48abfca3100badf1e636d658cf03b86936acc2d72cca0996' 
  AND token = '/bNWc+QzRtjeHfYI8W+9zhZWmg35wm2wfjdtcF41ALs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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