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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee0ea62b647117586864dea96bbcad6e3c5cb49941717831813980379100e8ea' 
  AND token = 'nRGwvLUDyp3d+AGP2yrkVMHNNQ5Fm/tq4g1ZHxE/YyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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