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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a81b7df4d92b27c951fea3b8e49613ac36132f45af3957663d2d663ed602a2' 
  AND token = 'FTjU/WSRAlA6DXRNhYISZHtxkNfZ1REJqZ7DD6CeERc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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