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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc00783cf8f2cd5855f7a87fd30d9e0230dcf0be29124ed662867c0143ef6edd' 
  AND token = 'bXpoGLel9pm8jafkqKJ2hhrF93VKK06abPRoRvTv+fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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