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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15e81edbdd7fd39e14b071319d6ed957f95e56d0d2b7ae8279212dbe9b380f81' 
  AND token = 'SJDNvqGPFfmR362EGOTv3j3xwa8cWmdC59KsPvi8muU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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