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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d32b848277fdd7bf952c1e648d9775dd257f03b8d8db75aa306ce70e52e3d4' 
  AND token = '7mopMm+FGkGOFchr+3KmrdYnYi37MxB8SvJifI8Jl4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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