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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cd3aa4cf7d9061515fa631e35a3f2f101bc19a1f7ae5fd17115f0bfb9be3cb0' 
  AND token = '9oj6NQdvmESUA/6xf5HSoIYPIPcXsx8c6hWBcbHFIfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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