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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e77bf7fc284b53e725478f49e66264e41b63096019aa1608606807f4db49d02' 
  AND token = 'WzCX3yt8UGGWt5xyctc8JwZnvODNQEqlZez4syBwatI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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