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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba3d0531745ae69e30c696c42e0363dffd3e2a6662bc4bf2fabbb487b9cff6b' 
  AND token = '0A/uJq2y/E3t9V0h4u8PR/G8jlHoz9NvTJ5JHZ76CP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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