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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a5ad479e5f6445803c67139eac0e13b97edb2d3bfeb9a0b82ce542d74d15898' 
  AND token = 'XZGx4slRUpOgnk76UPQnSrUuVfHJsW0473XfyWZJWQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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