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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3094aa3eb9cc570c32f8c52f528e4f00ad00a9a6c2c49a980020e547ffb956d' 
  AND token = 'ATz3a/yXyByJquzKipKmFC5k7gQe9xApRyIUtil/d5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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