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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '349d362aee7df7c3058e7ad7005440b233e6c100e69ffff9b4864d018146419a' 
  AND token = 'cn8FGZiXJH5fI+wfGBHKBPeP/6nCc5GDjRb+yUU15q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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