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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb85b978375fdcbc6aea5d7a0dd14fb2bd5f1128401ad90c9311fd687ccf29f' 
  AND token = 'og/8feebhlnPOCkpctdS6iZbXaCWb3zpZ9cDaD/EaMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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