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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db3969547225ee3cfcca57a4c62b2d9f5b5039f993be1267e020bd425ee39bce' 
  AND token = '6e9mkKqPjnKRyiEJnoEnFDfEEPUekqpeqTVnxIqpvlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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