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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6153ac23f974c8211f35b578c5b075b55362d3e48f0052038d6e1831ad1aa1dd' 
  AND token = 'Wl7tvMMNyvlurDD2WJ/uZ+B03fY4Nraub5oyiSQ0R44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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