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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2567321a5b82f677d0f5f4059a5135d70c89ff39582c62b9ea216e26efd00961' 
  AND token = '4/2GdOXkKBQP1NBbJSRVN/43r2Sbj6lk4tuf0IYLgSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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