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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c6d542d8bbcd8dff182397177be3dd60337a74e9e468661c16ed0ce21be56e' 
  AND token = '324WqDg97DtLUfC/AX7flfHp/GUL2Bb/JlMiaeKXkNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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