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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c59d7bc321204bf2f3a6ca9d7661e40dae6eb259bcb626eeaac949348d3c42b5' 
  AND token = '0KIMkLqKn9R7VquWh7INBOZneXgZejP8TNJOFdpMMpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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