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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b6d14a9c946497ba79d3401d639801dcf51b26c7282932e4c987c7a52e6237d' 
  AND token = '14NXXBcDs8KTquNtuB8qKxyDQnt6gS1oR9kIGNUTmmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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