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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e52a705dd5e6981c9c759e134d5872a638e22093ebf80fbc1e9826734aded3f' 
  AND token = '9lDAQwgS/DN9eWMABnYf13MCTewcHIPTjTD8e9x5feo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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