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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '399a4581adb18e14f31a3f58f45765c908b1426d8fc0eaf8c592cdca23287014' 
  AND token = 'lLEqGEV7Yza4g4lX8JIk6AlNdgd8ZuUVtDchtJ21GYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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