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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ee8784553c6055bedd4509f53d9e14f7ea2dea09b1e46707a338e12e9779ca' 
  AND token = 'ZlOnbRdpFTj7++QezJIR2Jg88b4COTNUhowdjrOh0xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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