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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf9e1800485cd524ea8a5f4d4cbfda5ddb1d70f771c6634ab43585f676172cf0' 
  AND token = 'jJIt3XmTvY1a1Aihgc4tbcPFBw5Ol0zuukWMWHFJZgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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