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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea662f42401fd4db0b364e76b5dce7bf077345bcfdd7ecdfb96c56b19c1388f' 
  AND token = 'gB+71o+Pz5/gVSatCejaBXpXrQrN3nSYq0aVuAsgX0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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