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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '842f1f89b8fc06addf7ba4b37b27f4ad7f572ef551700acafb4000e891aef0a0' 
  AND token = 'xd6ilqWOQeDxhAyQXnJk34VPu3mK6l/nmVAIOK+5cFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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