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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d2a48ddbc55440bc2ed5629d3950bb85485aeec2aaf815a182f0f44a42acaf6' 
  AND token = '5vVEzsrWPMZx0leG6TQefbhb4tj76TCXe0bUqLnHqss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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